Friction grip for wrenches and the like



Aug. 18: 1925.

N. NASH FRICTION GRIP FOR WRENCHES AND THE LIKE Filed March 22'. 1923 Mc/r NASH f wwm Air J Patented Aug. 18, 1%25.

NICK NASH, F LONG- BEACH, CALIFORNIA.

FRICTION GRIP FOR VTRENCHES AND THE LIKE.

Application filed March 22, 1923.

To all whom it may concern."

Be it known that 1, N NASH, a citizen of the United States, residing at Long Beach, in the county of Los Angeles and State of California, have invented new and useful Improvements in Friction Grips for Wrenches and the like, of which the following is a specification.

My invention relates to intermittent grip devices, and a purpose of my invention is the provision of a grip device of an extremely simple, durable, and inexpensive construction which is operable to provide an intermittent frictional grip of any element such as a wrench to be rotated in a step by step movement for actuating the element in such manner that even the slightest degree of movement thereof can be effected.

It is also a purpose of my invention to provide an intermittent grip device which is particularly adapted, although not necessarily, for use in conjunction with socket wrenches, the invention in its present embodiment including a support having extensions either of which is adapted to receive a socket wrench so that with the gripping device mounted upon the support, it can be actuated to effect rotation of the wrench in either direction depending upon the extension upon which. the wrench is mounted.

Although I have herein shown and described only one form of gripping device embodying my invention, and as applied to a wrench, it is therefore understood that the invention is not limited to such use and that various changes and modifications may be made herein without departing from the spirit of the invention or the spirit and scope of the appended claims.

In the accompanying drawings,

Figure 1 is a view showing in top plan one form of gripping device embodying my invention.

Fig. 2 is a horizontal sectional view of the gripping device shown in Fig. 1.

Fig. 3 is a vertical sectional view taken on the line 83 of Fig. 1.

Fig. 4 is a view showing the gripping device in applied position with respect to a wrench.

Similar reference characters refer to similar parts in each of the several figures.

Referring specifically to the drawings, my invention in its present embodiment comprises a split band formed with resilient Serial No. 626,539.

metal or other suitable material, and which provided atits ends with lateral extensions 16 and 17, the former being of greater length than the latter and provided with an opening adapted to receive a pivot pin 18 upon which an operating lever 19 is fulcrumed. The lever 19 in the present instance is shown as of tubular formation with one end slotted to accommodate the extension 16 and to thereby allow of the necessary locking movement of the lever upon the extension. The extension 17 is adapted to receive a pin 20 designed for the purpose of pivotally connecting one end of the links 21, the other end of the links being pivotally connected to the lever 19 by means of a pin These pins 18, 20, and 22 may be in the form of bolts so to allow of the readily assembling and detaching of the several elements, as will be understood.

The extensions '16 and 17 are provided with registering openings at points adjacent their connection with the ends of the band 15, and for the purpose of receiving an ad justing bolt 23 provided at one end with a head 24 and carrying at its opposite end a nut The bolt 23 is of such a length as to accommodate coiled expansible spring 26 and at a point between the head 24.- and extension 16. This spring normally functions to constrict the band 15, and by virtue of the nut an adjustment of the spring can be readily effected to vary its constricting action upon the band 15.

As shown in Fig. 3, the band 15 is adapted to embrace a support 27 formed of metal or other suitable material and provided at its opposite sides with extensions 28. These project from the sides of the support at common points so that they are longitudinally aligned and axially deposed with respect to the support. Plates or rings 29 are secured to the opposite sides of the support 27 by screws 30 or other suitable fastening members, and these rings project at their peripheries from the periphery of the support so as to provide flanges for preventing displacement of the band 15 from the support, while at the same time allowing free rotation of the band upon the support.

The extensions 28 are of angular shape in cross section so as to accommodate a conventional form of socket wrench 31, (Fig. 1), the angularity of the extensions providing a positive conn ction between the support and the wrench so that when the former upon its pivot 18 to cause the links 21 to be forced in the direction of the extension 17 thereby causing the extension to move outwardly from the extension 16 ano against the action of the spring 26 to effect an e2:- pansion of the band 15. By this operation it will be seen that the band when expanded will release the support suidciently to allow of the movement of the entire gripping device without effecting a rotation of the support. By moving-the operating lever first forwardly and then rearwarc ly it will e clear that an intermittent gripping of the support 27 is effected sons to cause rotation of the support in a step by step movement.

From a consideration of Fig. 2, it will be manifest that the operativeconnection between the operating lever and the band 15 is such that only the slightest degree of retrograde movement of the'operating lever is necessary to effect the required expansion of the band 15 to release the support 27 and to again grip the latter when the operating lever is moved forwardly. As a result of this action, it is possible to actuate the wrench 31 to the slightest degree. This is of great advantage when employing the gripping device in inaccessible places where the movement of the operating lever is re stricted as it will be understood that if it is possible to move the operating lever actuation of the gripping device can be effected to operate the wrench.

What I claim is:

An intermittent grip device comprisin a split resilient band, extensions formed on the ends of the band, an element extending through and adjustable on the extensions, a spring mounted on the element and normally urging the band to constricted position, a lever fulcrumed on one of the extensions and links operatively connecting the lever with the other extension and in such manner that when the lever is moved in one direction the links will be operated to c2:- pand the band against the action of said spring.

In testimony whereof I have signed my name to this specification.

NICK NASH. 

